|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Advanced Characterization Techniques for Quantifying and Modeling Deformation
||Impact of Microstructural Features on the Grain-orientation Dependent Strain Hardening and Softening Mechanisms in Al-Cu Alloys
||Brian Milligan, Dong Ma, Lawrence Allard, Amit Shyam
|On-Site Speaker (Planned)
Grain orientation dependent deformation behavior of two commercial cast Al-Cu alloys (206 and RR350) was studied using <I>in situ</I> neutron diffraction during tensile deformation, and <I>ex situ</I> scanning transmission electron microscopy. Observations include grain-scale anisotropy during plastic deformation in both alloys, with grains whose <200> direction are oriented along the tensile axis showing the least strain hardening at room temperature and the most softening at 300°C. At room temperature, the alloys behaved similarly. At 300°C, RR350 showed strain hardening, then strain softening, while 206 began softening immediately after yielding. These observations support the conclusion that dominant plasticity mechanisms were Orowan looping for both alloys at room temperature, precipitate shearing for RR350 at 300°C, and dynamic recovery for 206 at 300°C. Property differences between alloys were attributed to different precipitate sizes and morphologies.
Research was sponsored by the LDRD Program of ORNL, managed by UT-Battelle, LLC, for the U. S. DOE.
||Planned: Supplemental Proceedings volume